Question

Ionic size of O2- is greater than Al3+ though the two ions are isoelectronic

Answer 1

it is made Al2O3 because of the ion

Answer 2

Answer:
For isoelectronic anions, the more negative the ionic charge, the larger the ionic radius.
and For isoelectronic cations, the more positive the ionic charge, the smaller the ionic radius.
hope it helps